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General System Events
Error Message
Battery Charging Fault On Failure of the battery-supervision
Battery Disconnected
Fault On
Configuration Memory
Checksum Failure
Configuration Memory
Write Failure
Control Unit Ground Fault
-Vdc ON
August 2013
Table 5-1. General System Events (Continued)
Probable Cause
circuitry
Faulty battery connection
Note: Battery disconnected-fault
messages do not disappear
immediately when corrected. The
control unit only rechecks the battery
connection once per minute.
Internal software fault
Faulty upload of applications program
or improper execution of a
configuration change via the menu
system
Low impedance path between
negative field conductor and earth
ground. Normal earth-ground offset
voltage is 6.6 Vdc (nom.) relative to
system common (e.g., main circuit
board TB2-1 or TB2-3).
• Check battery connections to main
circuit board TB3. Refer to Figure 2-9.
• Disconnect battery leads from main
circuit board TB3 and use digital volt-
ohm meter to measure battery open-
circuit voltage. Replace batteries if
open-circuit voltage is less than 19.5
Vdc.
• Replace the power supply assembly.
See Figure 2-4
• Replace printed-circuit board. See
Figure 2-6
• Check battery connections to main
circuit board TB3. Refer to Figure 2-9.
• Disconnect battery leads from main
circuit board TB3 and use digital volt-
ohm meter to measure battery open-
circuit voltage. Replace batteries if
open-circuit voltage is less than 19.5
Vdc.
• Re-upload applications program
• Re-test the system for proper
functionality
• Re-upload applications program if
message occurs after configuration
upload
• Re-execute configuration change via
menu operation if message appears
after menu operation
• Continuously monitor DC voltage
between earth-ground stud on left side
of back box and main circuit board TB2-
1. Voltage should be 6.6 (nom.) Vdc.
Earth ground is positive relative to
system common.
• Remove field circuits one at a time until
earth-ground offset voltage restores to
6.6 (nom.) Vdc.
• Check for connections to earth ground
on field circuit whose removal restored
proper earth-ground offset voltage.
5-2
Corrective Action
P/N 06-236530-001
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